Search 650Rider.com and XS650.com using Google!
|
| |
|
|
xs650 > > Motorcycle Systems > > Engine > > 256 Engine Parts Measurements |
---|
256 Engine Parts Measurements
|
Author |
Message |
ZouLou Full Member
Joined: Jun 01, 2008 Posts: 15 Location: St. Louis/Columbia MO
|
Posted: December 27, 2009, 9:46 pm Post subject: 256 Engine Parts Measurements |
|
Does anyone have a 256 piston and rod lying around? I could really use rod length measurements (hole center to hole center if possible) and on the piston a wrist pin hole to top edge of piston. I have a attached an image od the two measurements i need.
I need measurement C or A, B and Hole to Hole
I also need measurement A in this picture
|
|
Back to top |
|
|
despecial Full Member
Joined: Sep 26, 2009 Posts: 232 Location: D20000
|
Posted: December 28, 2009, 5:37 am Post subject: Re: 256 Engine Parts Measurements |
|
A....22mm piston wrist pin
B....34mm big end
C..136mm con rod centre to centre
D..?
A..?
_________________ Most motorcycle problems are caused by the nut that connects the handlebars to the saddle.
Last edited by despecial on December 29, 2009, 12:40 pm; edited 1 time in total |
|
Back to top |
|
|
ZouLou Full Member
Joined: Jun 01, 2008 Posts: 15 Location: St. Louis/Columbia MO
|
Posted: December 29, 2009, 1:19 am Post subject: Re: 256 Engine Parts Measurements |
|
Thanks a whole lot for those measurements. I am ordering a custom piston from Venolia and I think the pin placement is set for a 256 engine. I know the pin hole size is for sure. Here is the piston drawing.
|
|
Back to top |
|
|
despecial Full Member
Joined: Sep 26, 2009 Posts: 232 Location: D20000
|
Posted: December 29, 2009, 9:12 am Post subject: Re: 256 Engine Parts Measurements |
|
you should also be able to fit a complete crank-rod-piston assembly from a later model motor
_________________ Most motorcycle problems are caused by the nut that connects the handlebars to the saddle. |
|
Back to top |
|
|
yamaman Support Staff
Joined: Jan 04, 2007 Posts: 1638 Location: Perth Western Australia
|
Posted: December 29, 2009, 9:46 am Post subject: Re: 256 Engine Parts Measurements |
|
Despecial, you've put down the big end as 26mm pin.
Big end internal diameter is 34mm I think...........(well it's a 26mm pin & 34mm rod on the 447's anyway)
Edit: Just looked at Mikes, bearings suit all motors, so rod big end is 34mm.
_________________ Its not enough to have an aim in life, you have to pull the trigger! |
|
Back to top |
|
|
despecial Full Member
Joined: Sep 26, 2009 Posts: 232 Location: D20000
|
Posted: December 29, 2009, 12:39 pm Post subject: Re: 256 Engine Parts Measurements |
|
youre right-ive just checked my table and ive given the crank pin diameter not the big end...will edit the post
_________________ Most motorcycle problems are caused by the nut that connects the handlebars to the saddle. |
|
Back to top |
|
|
ZouLou Full Member
Joined: Jun 01, 2008 Posts: 15 Location: St. Louis/Columbia MO
|
Posted: December 29, 2009, 5:37 pm Post subject: Re: 256 Engine Parts Measurements |
|
OK here is the whole story with this question. I have a '79 XS650 engine. I got a head ported by 650performance.com. The porting was designed by Harry Lillie and the Venolia pistons were designed by him too to work specifically with his head porting. I am going to get a set of Carillo rods made for my application to ensure max rod strength. So looking at the piston design I realized they are set up for 22mm pins which come on the 256 engines. According to Craig Weeks the 256 rod and piston were preferred by top tuners for their dwell time at TDC. I am hoping to get the Venolia pistons and then use 256 sized rods and have it all work together with my rephased 447 crank. Any help or suggestions is greatly appreciated.
-Kyle
|
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You cannot download files in this forum
|
|
|
|
|
Check out the new Honda CB750 Forum at CB750.com! A site dedicated to the great Honda SOHC and DOHC CB750.
Check out the new Yamaha XS400 Forum at XS400.com!
Yamaha xs650
xs650, xs, 650, forum, links, chopper, custom, yamaha, parts, forum, info,
information, bb, bulletin board, XS650 650Rider, Free Unrestricted xs650
forum, Personal photo albums, Post images in Forum, News columns, Daily blog,
Links, Event calendar, Information for Yamaha XS650
Interactive software released under GNU GPL,
Code Credits,
Privacy Policy
|